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id="post-info"><h1 class="post-title">Vue源码开发-虚拟DOM04</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2021-01-03T16:00:00.000Z" title="发表于 2021-01-04 00:00:00">2021-01-04</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2021-01-03T16:00:00.000Z" title="更新于 2021-01-04 00:00:00">2021-01-04</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/%E6%BA%90%E7%A0%81/">源码</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">2.9k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>10分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="Vue源码开发-虚拟DOM04"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="Vue源码开发-虚拟DOM"><a href="#Vue源码开发-虚拟DOM" class="headerlink" title="Vue源码开发-虚拟DOM"></a>Vue源码开发-虚拟DOM</h1><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> 我们前面 已经把我们的拼接好的函数字符串 变成了真正的可执行函数</span><br><span class="line"><span class="number">2.</span> 接下来 我们就需要编写我们函数字符串里的 _c函数 和 _v函数 和 _s函数</span><br><span class="line"><span class="number">3.</span> 这些函数 其实就是在生成我们的虚拟DOM</span><br></pre></td></tr></table></figure>
<h2 id="初次挂载"><a href="#初次挂载" class="headerlink" title="初次挂载"></a>初次挂载</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> 此时我们的render函数已经写好了 </span><br><span class="line"><span class="number">2.</span> 所以接下来 我们就需要创建的我们DOM结构 然后 把数据 和方法渲染到我们的页面上</span><br><span class="line"><span class="number">3.</span> 所以我们在判断有没有render函数之后 接下来就要调用mountComponent方法 渲染页面</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">export</span> <span class="function"><span class="keyword">function</span> <span class="title">initMixin</span>(<span class="params">Vue</span>)</span>&#123;</span><br><span class="line">    Vue.prototype._init = <span class="function"><span class="keyword">function</span> (<span class="params">options</span>)</span>&#123;</span><br><span class="line">        <span class="keyword">const</span> vm = <span class="built_in">this</span></span><br><span class="line">        vm.$options = options</span><br><span class="line">        <span class="comment">// 1. 这里我们初始化了数据 比如data里的响应式 mothds方法 props属性 watch computed等</span></span><br><span class="line">        initState(vm)</span><br><span class="line">        <span class="keyword">if</span>(vm.$options.el)&#123;</span><br><span class="line">        <span class="comment">//2. 然后开始我们的首次渲染数据 这里分为两个部分  </span></span><br><span class="line">            vm.$mount(vm.$options.el)</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    Vue.prototype.$mount = <span class="function"><span class="keyword">function</span>(<span class="params">el</span>)</span>&#123;</span><br><span class="line">        <span class="keyword">const</span> vm = <span class="built_in">this</span></span><br><span class="line">        <span class="keyword">const</span> options = vm.$options</span><br><span class="line">        <span class="comment">//2.1 第一个部分是 拿到我们的如果有render函数直接就调用如果没有就把template 里的HTML结构字符串解析成AST语法树 然后在编译成render函数 </span></span><br><span class="line">        <span class="keyword">let</span> ele = <span class="built_in">document</span>.querySelector(el)</span><br><span class="line">        <span class="keyword">if</span>(!options.render)&#123;</span><br><span class="line">            <span class="keyword">let</span> template = options.template</span><br><span class="line">            <span class="keyword">if</span>(!template &amp;&amp; ele)&#123;</span><br><span class="line">                template = ele.outerHTML</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="keyword">const</span> ast = compileToFunctions(template)</span><br><span class="line">            <span class="keyword">const</span> code = generate(ast)</span><br><span class="line">            <span class="keyword">const</span> render = <span class="string">`with(this)&#123;return <span class="subst">$&#123;code&#125;</span>&#125;`</span></span><br><span class="line">            <span class="keyword">let</span> fn = <span class="keyword">new</span> <span class="built_in">Function</span>(render)</span><br><span class="line">            options.render = fn</span><br><span class="line">        &#125;</span><br><span class="line">      <span class="comment">//3.第二个部分 就是在mountComponent里 执行我们的rendenr函数 这里我们需要编写_c函数 _v函数 _s函数等 并且生成虚拟DOM</span></span><br><span class="line">        mountComponent(vm,ele)</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h2 id="mountComponent函数"><a href="#mountComponent函数" class="headerlink" title="mountComponent函数"></a>mountComponent函数</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> 这个方法 在lifecycle.js</span><br><span class="line"><span class="number">2.</span> 主要执行我们上面写好的render函数里的_c函数 _v函数 _s函数等 并且生成虚拟DOM</span><br><span class="line"><span class="number">3.</span> 这里主要的流程是先调用我们的 _render方法 他的返回值就是我们的虚拟DOM 传入到我们的_update函数里</span><br><span class="line"><span class="number">4.</span> 然后在调用我们的 _update方法 去把我们的虚拟DOM 生成真实的DOM 最后渲染到页面上</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// lifecycle.js</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//2021 02 16</span></span><br><span class="line"><span class="comment">// 3. 在Vue的原想上混入我们的_update方法</span></span><br><span class="line"><span class="keyword">export</span> <span class="function"><span class="keyword">function</span> <span class="title">lifecycleMixin</span>(<span class="params">Vue</span>)</span>&#123;</span><br><span class="line">    Vue.prototype._update = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="comment">//4. 这里主要把我们的虚拟DOM vnode 生成 真实DOM 渲染到页面上</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">export</span> <span class="function"><span class="keyword">function</span> <span class="title">mountComponent</span>(<span class="params">vm,el</span>)</span>&#123;</span><br><span class="line"></span><br><span class="line">   <span class="comment">//1. 调用render 方法 渲染 真实DOM</span></span><br><span class="line"></span><br><span class="line">   <span class="comment">//2. 先调用render函数生成虚拟DOM 为了以后更新使用</span></span><br><span class="line">   <span class="comment">// 然后调用_update方法 把我们的虚拟DOM 渲染成页面真实的DOM</span></span><br><span class="line">   <span class="comment">// 这里我们在 src/index.js 通过 renderMixin 方法已经把_render挂载到原型上了</span></span><br><span class="line">   vm._update(vm._render())</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h2 id="函数的调用逻辑"><a href="#函数的调用逻辑" class="headerlink" title="函数的调用逻辑"></a>函数的调用逻辑</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> 首先我们在 写Vue的构造函数的时候 调用了我们的_init方法</span><br><span class="line"><span class="number">2.</span> _init方法 是通过我们调用initState方法 把Vue传入进去然后 然后在原型上挂载了_init方法 在这个里面执行了我们initState函数 初始化了状态 数据的响应式 methods watch computed props等等 然后调用了我们的$mount方法</span><br><span class="line"><span class="number">3.</span>然后我们在 $mount方法中 编译了template 生成AST语法树 然后编译成render函数 然后开始渲染我们的页面 调用了 mountComponent方法 </span><br><span class="line"><span class="number">4.</span> 此时这个mountComponent方法 里面 调用了我们的_update方法 和_render方法 这两个方法 和我们的 _init方法一样 也是在我们写Vue的方法 通过更重的混入函数 把这些方法挂在到了我们的原型 我们在可以嗲用</span><br><span class="line"><span class="number">5.</span> lifecycleMixin方法 把我们的_update 方法 挂载到了我们的原型上</span><br><span class="line"><span class="number">6.</span> renderMixin 方法 把我们的_render 方法挂在到了原型上</span><br><span class="line"><span class="number">7.</span> 而我们的 mountComponent方法 就调用了_update方法 里面的参数 就是调用_render方法的返回值 也就是虚拟dom</span><br></pre></td></tr></table></figure>
<h2 id="render方法"><a href="#render方法" class="headerlink" title="_render方法"></a>_render方法</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> 首先我们在 mountComponent方法 中调用了_update方法</span><br><span class="line"><span class="number">2.</span> 在 _update方法中 我们调用了_render方法 他的返回值就是虚拟DOM</span><br><span class="line"><span class="number">3.</span> 这个_render方法 就是我们通过AST语法树 生成的render函数 已经生成完毕之后 就把他挂在我们的option.render上了</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//2021 02 16</span></span><br><span class="line"><span class="comment">// 3. 在Vue的原想上混入我们的_update方法</span></span><br><span class="line"><span class="keyword">export</span> <span class="function"><span class="keyword">function</span> <span class="title">lifecycleMixin</span>(<span class="params">Vue</span>)</span>&#123;</span><br><span class="line">    Vue.prototype._update = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="comment">//4. 这里主要把我们的虚拟DOM vnode 生成 真实DOM 渲染到页面上</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="function"><span class="keyword">function</span> <span class="title">mountComponent</span>(<span class="params">vm,el</span>)</span>&#123;</span><br><span class="line"></span><br><span class="line">   <span class="comment">//1. 调用_render 方法 创建虚拟DOM</span></span><br><span class="line"></span><br><span class="line">   <span class="comment">//2. 先调用render函数生成虚拟DOM 为了以后更新使用</span></span><br><span class="line">   <span class="comment">// 然后调用_update方法 把我们的虚拟DOM 渲染成页面真实的DOM</span></span><br><span class="line">   <span class="comment">// 这里我们在 src/index.js 通过 renderMixin 方法已经把_render挂载到原型上了</span></span><br><span class="line">   vm._update(vm._render())</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> _render方法 主要生成vdom 也就是虚拟DOM</span><br><span class="line"><span class="number">2.</span> 这里生成虚拟DOM的数据 就是我们通过AST语法树 生成的render函数 里面有_c函数 _v函数 _s函数 的执行结果</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//2021 02 16</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="function"><span class="keyword">function</span> <span class="title">renderMixin</span>(<span class="params">Vue</span>)</span>&#123;</span><br><span class="line">    <span class="comment">//7. 创建元素</span></span><br><span class="line">    Vue.prototype._c = <span class="function"><span class="keyword">function</span>(<span class="params">tag,attrs,children</span>)</span>&#123;</span><br><span class="line">        <span class="comment">//7.1 这里我们在单独写一个创建元素的方法 createElement</span></span><br><span class="line">        <span class="keyword">return</span> createElement(...arguments)</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">//8. 创建文本</span></span><br><span class="line">    Vue.prototype._v = <span class="function"><span class="keyword">function</span>(<span class="params">val</span>)</span>&#123;</span><br><span class="line">        <span class="comment">//8.1 这里我们在单独编写一个创建文本的方法createTextVnode</span></span><br><span class="line">        <span class="keyword">return</span> createTextVnode(val)</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">// 9. 创建我们的 data里面变量的数据 因为我们模版 有可能是文本和&#123;&#123;&#125;&#125;这种混合的</span></span><br><span class="line">    <span class="comment">// 由于这里我们已经用with语法处理过 所以他会自己去找this上的变量 也就是我们data里的数据上的变量</span></span><br><span class="line">    Vue.prototype._s = <span class="function"><span class="keyword">function</span>(<span class="params">val</span>)</span>&#123;</span><br><span class="line">        <span class="comment">//9.1 因为这里 你data里的其中一个数据 的值 还有可能是个对象 所以这里我们要用JSON转换一下</span></span><br><span class="line">       <span class="keyword">return</span> val == <span class="literal">null</span>?<span class="string">&#x27;&#x27;</span>:(<span class="keyword">typeof</span> val == <span class="string">&#x27;object&#x27;</span>)?<span class="built_in">JSON</span>.stringify(val):val</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">//5. 这个方法我们已经在 src/index.js 已经混入了</span></span><br><span class="line">    Vue.prototype._render = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="comment">//6. 这个方法的主要目的生成vnode 也就是虚拟DOM  然后生成的虚拟DOM 在传入给我们的_update方法 生成真实的DOM渲染页面</span></span><br><span class="line">        <span class="keyword">const</span> vm = <span class="built_in">this</span></span><br><span class="line">        <span class="comment">// 这里面调用的方法 其实就是我们刚刚最开始写拼接的字符串函数</span></span><br><span class="line">        <span class="keyword">const</span> render  = vm.$options.render</span><br><span class="line">        <span class="keyword">let</span> vnode = render.call(vm)</span><br><span class="line">        <span class="built_in">console</span>.log(vnode,<span class="string">&#x27;----vnode&#x27;</span>)</span><br><span class="line">        <span class="keyword">return</span> vnode</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">//10. 创建虚拟元素的方法 在_c中调用</span></span><br><span class="line"><span class="comment">// _c(&#x27;div,属性,儿子1,儿子2,儿子3......)</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">createElement</span>(<span class="params">tag,data=&#123;&#125;,...children</span>)</span>&#123;</span><br><span class="line">    <span class="comment">// 这里就相当于在生成我们的虚拟DOM了 如果你是元素的化 应该生成什么样的虚拟DOM</span></span><br><span class="line">    <span class="comment">// 比如有我们的标签名 有没有数据 孩子</span></span><br><span class="line">    <span class="keyword">return</span> vnode(tag,data,data.key,children)</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">//11. 创建虚拟文本的方法 在_v中调用</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">createTextVnode</span>(<span class="params">text</span>)</span>&#123;</span><br><span class="line">    <span class="comment">// 如果是文本的化我们就对应生成我们的什么样的虚拟DOM</span></span><br><span class="line">    <span class="comment">// 文本就是一个文本 没有 属性 没有标签名之类的</span></span><br><span class="line">    <span class="keyword">return</span> vnode(<span class="literal">undefined</span>,<span class="literal">undefined</span>,<span class="literal">undefined</span>,<span class="literal">undefined</span>,text)</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">//12. 创建虚拟DOM的方法</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">vnode</span>(<span class="params">tag,data,key,children,text</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">return</span>&#123;</span><br><span class="line">        tag,</span><br><span class="line">        data,</span><br><span class="line">        key,</span><br><span class="line">        children,</span><br><span class="line">        text</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h2 id="update方法"><a href="#update方法" class="headerlink" title="_update方法"></a>_update方法</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> 我们通过上面的已经知道 函数的调用逻辑 以及_render方法 返回的是虚拟DOM</span><br><span class="line"><span class="number">2.</span> 接下来我们就需要 虚拟DOM 去创建真实的DOM</span><br><span class="line"><span class="number">3.</span> 首先 我们需要拿到老的节点。和新的虚拟DOM</span><br><span class="line"><span class="number">4.</span> 这里其中我们还有一对比的逻辑 这里先不写</span><br><span class="line"><span class="number">5.</span> 然后 我们根据拿到的虚拟DOM创建真实的DOM 插入到老的真实DOM后面 然后在删除老的虚拟DOM</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 3. 在Vue的原想上混入我们的_update方法</span></span><br><span class="line"><span class="keyword">export</span> <span class="function"><span class="keyword">function</span> <span class="title">lifecycleMixin</span>(<span class="params">Vue</span>)</span>&#123;</span><br><span class="line">    </span><br><span class="line">    Vue.prototype._update = <span class="function"><span class="keyword">function</span>(<span class="params">vnode</span>)</span>&#123;</span><br><span class="line">        <span class="keyword">const</span> vm = <span class="built_in">this</span></span><br><span class="line">        <span class="comment">//4. 这里主要把我们的虚拟DOM vnode 生成 真实DOM 渲染到页面上</span></span><br><span class="line">        <span class="comment">//5. 主要就是调用我们的patch方法 </span></span><br><span class="line">        patch(vm.$el,vnode)</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// vnode格式</span></span><br><span class="line">children: (<span class="number">3</span>) [&#123;…&#125;, &#123;…&#125;, &#123;…&#125;]</span><br><span class="line">data: &#123;<span class="attr">id</span>: <span class="string">&quot;app&quot;</span>, <span class="attr">class</span>: <span class="string">&quot;init&quot;</span>, <span class="attr">style</span>: &#123;…&#125;&#125;</span><br><span class="line">el: div</span><br><span class="line">key: <span class="literal">undefined</span></span><br><span class="line">tag: <span class="string">&quot;div&quot;</span></span><br><span class="line">text: <span class="literal">undefined</span></span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// vdom / path.js</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//2021 02 16</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="function"><span class="keyword">function</span> <span class="title">patch</span>(<span class="params">oldVnode,vnode</span>) </span>&#123;</span><br><span class="line">    <span class="comment">//1. 这里面就是如果是首次渲染 就把我们的vnode虚拟DOM生成我们的真实DOM</span></span><br><span class="line">    <span class="comment">// 该创建元素的创建元素 该生成文本的 生成文本</span></span><br><span class="line">    <span class="comment">// 然后我们最早挂在el上的元素干掉替换成我们的创建好的真实DOM</span></span><br><span class="line">    <span class="comment">//2. 根据虚拟DOM创建真实DOM</span></span><br><span class="line">    <span class="keyword">let</span> el = createElm(vnode)</span><br><span class="line">    <span class="comment">//3. 第一次 oldVnode 就是我们的&lt;div id=&quot;app&quot;&gt;&lt;/div&gt;</span></span><br><span class="line">    <span class="comment">// 然后拿到我们的父节点删除我们的老节点</span></span><br><span class="line">    <span class="keyword">let</span> parentElm = oldVnode.parentNode</span><br><span class="line">    <span class="comment">// 然后把我们创建好的真实DOM 插入进去我们老节点的下一个节点</span></span><br><span class="line">    parentElm.insertBefore(el,oldVnode.nextSibling)</span><br><span class="line">    <span class="comment">//然后移除我们的元素</span></span><br><span class="line">    parentElm.removeChild(oldVnode)</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">//4. 创建我们的真实DOM</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">createElm</span> (<span class="params">vnode</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">let</span> &#123;tag,children,key,data,text&#125; = vnode</span><br><span class="line">    <span class="comment">//4.1 如果是标签我们就创建标签 如果有儿子我们就接着创建 递归</span></span><br><span class="line">    <span class="keyword">if</span>(<span class="keyword">typeof</span> tag === <span class="string">&#x27;string&#x27;</span>)&#123;</span><br><span class="line">        vnode.el = <span class="built_in">document</span>.createElement(tag)</span><br><span class="line">        children.forEach(<span class="function"><span class="params">child</span> =&gt;</span> &#123;</span><br><span class="line">            <span class="comment">//并且 插入到我们创建好的元素中</span></span><br><span class="line">            vnode.el.appendChild(createElm(child))</span><br><span class="line">        &#125;)</span><br><span class="line">    &#125;<span class="keyword">else</span>&#123;</span><br><span class="line">        <span class="comment">//4.2 如果是文本我们就直接创建</span></span><br><span class="line">        vnode.el = <span class="built_in">document</span>.createTextNode(text)</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">//最后创建好的 就是返回的我们的真实元素 </span></span><br><span class="line">    <span class="keyword">return</span> vnode.el</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h2 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> 以上我们就 写好首次渲染的逻辑 这里首次渲染。是指我们的模版都解析完毕之后 生成了render函数 然后创建虚拟DOM 然后 把虚拟DOM 变成真实的DOM 插入到页面中 这里并没有更新的操作</span><br><span class="line"><span class="number">2.</span> 这里我们还是有几个流程 首先 我们在init函数里 调用initState 函数 初始化了 数据 方法 props watch 等等 </span><br><span class="line"><span class="number">3.</span> 然后判断你有没有传入el 如果有 我们就调用$mount函数开始渲染 </span><br><span class="line"><span class="number">4.</span> 首先 $mount 函数 第一步 根据我们的tepmlate 生成了我们的render函数 这里所生成的render函数 是根据我们template 编译之后生成的AST语法树去生成的 主要 就是就是拼接函数的字符串 _c函数 _v函数 _s函数</span><br><span class="line"><span class="number">5.</span> 然后调用我们的mountComponent函数 去开始生成我们的虚拟DOM 和我们的 真实的DOM 并把真实DOM插入到页面上 然后删除老的DOM</span><br><span class="line"><span class="number">6.</span> 这面 在 mountComponent 主要调用了_update函数 而_update函数 调用了我们的_render函数</span><br><span class="line"><span class="number">7.</span> 这两个函数 我们在创建Vue构造函数的的时候 通过写根init函数一样的逻辑 挂在到了原型上 </span><br><span class="line"><span class="number">8.</span> 而_render函数 就是我们以上通过AST创建的render函数 这个函数调用的时候 就是调用了里面的生成_c函数_v函数_s函数</span><br><span class="line"><span class="number">9.</span> _render函数里 主要是编写了以上我们的 _c函数_v函数_s函数 这里 主要的目的是生成vnode 也就是虚拟DON</span><br><span class="line"><span class="number">10.</span> 然后我们在_update函数里 拿到我们刚刚生成的虚拟DOM 去做首次的渲染</span><br><span class="line"><span class="number">11.</span> _update函数在拿到虚拟DOM的时候 如果你是标签 我们就创建真实DOM 然后在便利你的孩子 才递归的去判断是不是标签 然后插入到自己这里 </span><br><span class="line"><span class="number">12.</span> 最后我们把创建好的真实的DOM 插入到我们的老DOM下一个节点 然后删除 老的节点</span><br></pre></td></tr></table></figure>
</article><div class="post-copyright"><div class="post-copyright__title"><span class="post-copyright-info"><h>Vue源码开发-虚拟DOM04</h></span></div><div class="post-copyright__type"><span class="post-copyright-info"><a href="http://example.com/2021/01/04/Vue%E6%BA%90%E7%A0%81%E5%BC%80%E5%8F%91%E4%B9%8B%E8%99%9A%E6%8B%9FDOM04/">http://example.com/2021/01/04/Vue%E6%BA%90%E7%A0%81%E5%BC%80%E5%8F%91%E4%B9%8B%E8%99%9A%E6%8B%9FDOM04/</a></span></div><div class="post-copyright-m"><div class="post-copyright-m-info"><div class="post-copyright-a"><h>作者</h><div class="post-copyright-cc-info"><h>北城韩雨</h></div></div><div class="post-copyright-c"><h>发布于</h><div class="post-copyright-cc-info"><h>2021-01-04</h></div></div><div class="post-copyright-u"><h>更新于</h><div class="post-copyright-cc-info"><h>2021-01-04</h></div></div><div class="post-copyright-c"><h>许可协议</h><div class="post-copyright-cc-info"><a class="icon" rel="noopener" target="_blank" title="Creative Commons" 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<p style="background:rgba(255,255,255,1);margin:0"> <img src="/img/code.png"></img> </p></div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#Vue%E6%BA%90%E7%A0%81%E5%BC%80%E5%8F%91-%E8%99%9A%E6%8B%9FDOM"><span class="toc-text">Vue源码开发-虚拟DOM</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%88%9D%E6%AC%A1%E6%8C%82%E8%BD%BD"><span class="toc-text">初次挂载</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#mountComponent%E5%87%BD%E6%95%B0"><span class="toc-text">mountComponent函数</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%87%BD%E6%95%B0%E7%9A%84%E8%B0%83%E7%94%A8%E9%80%BB%E8%BE%91"><span class="toc-text">函数的调用逻辑</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#render%E6%96%B9%E6%B3%95"><span class="toc-text">_render方法</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#update%E6%96%B9%E6%B3%95"><span class="toc-text">_update方法</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E6%80%BB%E7%BB%93"><span class="toc-text">总结</span></a></li></ol></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/2021/04/16/gin-vue-admin/" title="Gin-Vue-Admin"><img src="/img/gin-vue-admin.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Gin-Vue-Admin"/></a><div class="content"><a class="title" href="/2021/04/16/gin-vue-admin/" title="Gin-Vue-Admin">Gin-Vue-Admin</a><time datetime="2021-04-15T16:00:00.000Z" title="发表于 2021-04-16 00:00:00">2021-04-16</time></div></div><div class="aside-list-item"><a class="thumbnail" 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